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31=3y+8(y+8)
We move all terms to the left:
31-(3y+8(y+8))=0
We calculate terms in parentheses: -(3y+8(y+8)), so:We get rid of parentheses
3y+8(y+8)
We multiply parentheses
3y+8y+64
We add all the numbers together, and all the variables
11y+64
Back to the equation:
-(11y+64)
-11y-64+31=0
We add all the numbers together, and all the variables
-11y-33=0
We move all terms containing y to the left, all other terms to the right
-11y=33
y=33/-11
y=-3
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